She's told Digital Spy the movie's 'about being a woman in the entertainment business'.

Clues: As Us Weekly have pointed out, the most recent Instagram photo Tommy's posted of Heather went up on June 9

Heather said: 'It's hard – you want to make a movie about how some of the entertainment industry is sexist, and then you're like: "Why doesn't everyone want to make this movie?"'

She added that 'people say that female-driven movies don't make money, when it's not true, obviously. There are movies out there that are making money... but it's not as common that they'll green-light movies with female leads.'

This movie is her directorial debut, and she's said of taking on that role, as well as writing: 'It's like: "You know what, maybe no-one's giving me the job I really want, so I'm going to give it to myself"'.

Pictured last September: The insider made the claim to Us Weekly , who have yet to get a reply from 47-year-old Heather's representative after asking for comment